# CVE-2026-44572: Next.js: Middleware / Proxy redirects can be cache-poisoned

> CVE-2026-44572: Next.js: Middleware / Proxy redirects can be cache-poisoned. CVSS 3.7 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-44572
Last updated: 2026-06-17T10:50:48Z

- Published: 2026-05-13 15:57 UTC · Updated: 2026-06-17 10:50 UTC · Assigner: GitHub\_M
- CVSS: 3.7 (CVSS 3.1) · Severity: Low · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
- EPSS: 0.28%, 21th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-349

## Description

Next.js is a React framework for building full-stack web applications. From 12.2.0 to before 15.5.16 and 16.2.5, an external client could send a x-nextjs-data header on a normal request to a path handled by middleware that returns a redirect. When that happened, the middleware/proxy could treat the request as a data request and replace the standard Location redirect header with the internal x-nextjs-redirect header. Browsers do not follow x-nextjs-redirect, so the response became an unusable redirect for normal clients. If the application was deployed behind a CDN or reverse proxy that caches 3xx responses without varying on this header, a single attacker request could poison the cached redirect response for the affected path. Subsequent visitors could then receive a cached redirect response without a Location header, causing a denial of service for that redirect path until the cache entry expired or was purged. This vulnerability is fixed in 15.5.16 and 16.2.5.

## Affected vendors and products

- vercel: next.js

## Tracked companies

- [Vercel](https://rewindex.com/company/vercel.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-44572)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-44572)
- [https://github.com/vercel/next.js/security/advisories/GHSA-3g8h-86w9-wvmq](https://github.com/vercel/next.js/security/advisories/GHSA-3g8h-86w9-wvmq)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-44572 · Markdown: https://rewindex.com/cve/CVE-2026-44572.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-44572 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:05:13.572Z